What is the Delve end game

At the present time Delve gear maxes out at Tier 8, and drop Hero Class gear, but you can’t get Gilded Crests unless you get lucky on a Tier 8 Bountiful Delve. Why not let players who do Tiers 9 through 11 get Gilded Crests as rewards. I have a tone of Hero class gear but it will never go beyond 619 at the rate Gilded crests are dropping in Tier 8s.

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